1885.| Recent Literature. 1195 
selves at all, owing to the heavy round body and feebler suckers. 
Fig. 10 represents one on its back with as many feet as possible 
è 
r Az 
Fic. 8,—Natural righting movements of the common star-fish. 
protruded downwards and fastened firmly to the floor, “their 
combined action then serves to tilt the globe slightly over in 
their own direction, the anchoring feet on the other or opposite 
Fic. 9.—Righting movements of Astropecten. 
rows meanwhile releasing their hold of the tank to admit of this 
tilting. The effect of this tilting is to enable the next feet in the 
